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Significant accounting policies and recent accounting pronouncements (Tables) | 6 Months Ended
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Jun. 30, 2018
Disaggregation of revenue |
| Six Months Ended June 30, 2018
Time charters | $ | 152,079
Voyage charters |  | 99,029
Pool revenues |  | 2,553
| $ | 253,661
Cumulative effect of changes |
Impact of the adoption of ASC 606 |
| December 31, 2017 |  | Effect of Adoption of ASC 606 |  | January 1, 2018
Assets |  |  |  |  |  |  |  |
Trade accounts receivable | $ | 18,521 |  | $ | (2,383) |  | $ | 16,138
Other current assets |  | 5,157 |  |  | 1,660 |  |  | 6,817
Liabilities |  |  |  |  |  |  |  |
Deferred revenue |  | 7,229 |  |  | (1,137) |  |  | 8,366
Accrued liabilities |  | 10,521 |  |  | 3 |  |  | 10,518
Stockholders' Equity |  |  |  |  |  |  |  |
Accumulated deficit |  | (1,036,303) |  |  | (1,857) |  |  | (1,038,160)
Income Statement Location |
Impact of the adoption of ASC 606 |
| For the six months ended June 30, 2018
|  | As Reported | Balances without Adoption of ASC 606 |  | Effect of Change
Voyage revenues | $ | 253,661 |  | $ | 253,922 |  | $ | (261)
Voyage expenses |  | 42,586 |  |  | 42,722 |  |  | 136
Charter-in hire expenses |  | 40,763 |  |  | 42,173 |  |  | 1,410
Net income/(loss) |  | 20,628 |  |  | 19,343 |  |  | 1,285
Earnings/(Loss) per share, basic | $ | 0.32 |  | $ | 0.30 |  | $ | 0.02
Earnings/(Loss) per share, diluted | $ | 0.32 |  | $ | 0.30 |  | $ | 0.02
Balance Sheet Location |
Impact of the adoption of ASC 606 |
| As of June 30, 2018
| As Reported |  | Balances without Adoption of ASC 606 |  | Effect of Change
Assets |  |  |  |  |  |  |  |
Trade accounts receivable | $ | 24,708 |  | $ | 27,212 |  | $ | (2,504)
Other current assets |  | 5,638 |  |  | 3,098 |  |  | 2,540
Liabilities |  |  |  |  |  |  |  |
Deferred revenue |  | 6,523 |  |  | 5,231 |  |  | (1,292)
Accrued liabilities |  | 11,475 |  |  | 11,495 |  |  | 20

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